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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3cbf674e69a2fc937135e74988113046c2ef02b2e4f7915fbf8c27e9208cbed' 
  AND token = 'rQlgX+kL+7M9dhfqcgNDAshXhV0p+2pMVu5IhSNDrVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}